I don't know about squarefractal, but I'm trying to use DroidCam to use my Nexus 5 as a webcam. This is an unorthodox setup, but luckily if you want to test it all you need is a semi-recent android phone. While using DroidCam could be related to the issue, it is worth noting that the person I was trying to webcam with was also using Windows 7 + DroidCam + Nexus 5 + Jitsi without any of the issues I am seeing. So it's still not a 100% repro case.